42140040 has 64 divisors (see below), whose sum is σ = 129850560. Its totient is φ = 10932480.

The previous prime is 42140029. The next prime is 42140047. The reversal of 42140040 is 4004124.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (42140047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306 + ... + 9185.

It is an arithmetic number, because the mean of its divisors is an integer number (2028915).

Almost surely, 2^42140040 is an apocalyptic number.

42140040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42140040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64925280).

42140040 is an abundant number, since it is smaller than the sum of its proper divisors (87710520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42140040 is a wasteful number, since it uses less digits than its factorization.

42140040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9542 (or 9538 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 42140040 is about 6491.5360277826. The cubic root of 42140040 is about 347.9885714307.

Adding to 42140040 its reverse (4004124), we get a palindrome (46144164).

The spelling of 42140040 in words is "forty-two million, one hundred forty thousand, forty".